Best PTR Site : Hits4Pay

Highest Advertising payment program
$10 Sign Up bonus
Earn $0.02 per view for each advertiser's email or ad.
Direct Referral Income (level one): Earn $0.01. Refer friends and earn $0.01 for each email that they read.
Referral Income: (level two): Earn $0.01. When your direct referrals refer others, you earn $0.01 per view of each advertiser's email or ad.
Payout: Any account that has reached the minimum payout of $25.00 or more will be zeroed out on the 1st of every month, and checks mailed out on or before the 15th.

Hits4pay is the best PTR site so far. And this is highly recommended.